From: Trond Myklebust Date: Sat, 14 Jul 2007 15:40:00 -0400 NFS: Clean up the (commit|read|write)_setup() callback routines Move the common code for setting up the nfs_write_data and nfs_read_data structures into fs/nfs/read.c, fs/nfs/write.c and fs/nfs/direct.c. Signed-off-by: Trond Myklebust --- fs/nfs/direct.c | 45 +++++++++++++++++++++++++++++++++-------- fs/nfs/nfs3proc.c | 41 ++++++-------------------------------- fs/nfs/nfs4proc.c | 49 +++++++-------------------------------------- fs/nfs/proc.c | 26 +++++------------------- fs/nfs/read.c | 38 ++++++++++++++++++----------------- fs/nfs/write.c | 51 ++++++++++++++++++++++++++++++++--------------- include/linux/nfs_xdr.h | 6 +++--- 7 files changed, 113 insertions(+), 143 deletions(-) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 5bcc764..244d1bd 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -272,8 +272,12 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq, unsigned long user_addr = (unsigned long)iov->iov_base; size_t count = iov->iov_len; size_t rsize = NFS_SERVER(inode)->rsize; + struct rpc_message msg = { + .rpc_cred = ctx->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), + .rpc_message = &msg, .callback_ops = &nfs_read_direct_ops, .flags = RPC_TASK_ASYNC, }; @@ -316,7 +320,7 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq, data->req = (struct nfs_page *) dreq; data->inode = inode; - data->cred = ctx->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(inode); data->args.context = ctx; data->args.offset = pos; @@ -326,10 +330,12 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq, data->res.fattr = &data->fattr; data->res.eof = 0; data->res.count = bytes; + msg.rpc_argp = &data->args; + msg.rpc_resp = &data->res; task_setup_data.callback_data = data; + NFS_PROTO(inode)->read_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->read_setup(data); rpc_execute(&data->task); @@ -434,6 +440,9 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq) struct inode *inode = dreq->inode; struct list_head *p; struct nfs_write_data *data; + struct rpc_message msg = { + .rpc_cred = dreq->ctx->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), .callback_ops = &nfs_write_direct_ops, @@ -448,6 +457,9 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq) get_dreq(dreq); + /* Use stable writes */ + data->args.stable = NFS_FILE_SYNC; + /* * Reset data->res. */ @@ -460,8 +472,10 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq) * since the original request was sent. */ task_setup_data.callback_data = data; + msg.rpc_argp = &data->args; + msg.rpc_resp = &data->res; + NFS_PROTO(inode)->write_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->write_setup(data, FLUSH_STABLE); /* * We're called via an RPC callback, so BKL is already held. @@ -509,15 +523,21 @@ static const struct rpc_call_ops nfs_commit_direct_ops = { static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq) { struct nfs_write_data *data = dreq->commit_data; + struct rpc_message msg = { + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = dreq->ctx->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(dreq->inode), + .rpc_message = &msg, .callback_ops = &nfs_commit_direct_ops, .callback_data = data, .flags = RPC_TASK_ASYNC, }; data->inode = dreq->inode; - data->cred = dreq->ctx->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(data->inode); data->args.offset = 0; @@ -526,8 +546,8 @@ static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq) data->res.fattr = &data->fattr; data->res.verf = &data->verf; + NFS_PROTO(data->inode)->commit_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(data->inode)->commit_setup(data, 0); /* Note: task.tk_ops->rpc_release will free dreq->commit_data */ dreq->commit_data = NULL; @@ -649,8 +669,12 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq, struct inode *inode = ctx->path.dentry->d_inode; unsigned long user_addr = (unsigned long)iov->iov_base; size_t count = iov->iov_len; + struct rpc_message msg = { + .rpc_cred = ctx->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), + .rpc_message = &msg, .callback_ops = &nfs_write_direct_ops, .flags = RPC_TASK_ASYNC, }; @@ -696,20 +720,23 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq, data->req = (struct nfs_page *) dreq; data->inode = inode; - data->cred = ctx->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(inode); data->args.context = ctx; data->args.offset = pos; data->args.pgbase = pgbase; data->args.pages = data->pagevec; data->args.count = bytes; + data->args.stable = sync; data->res.fattr = &data->fattr; data->res.count = bytes; data->res.verf = &data->verf; task_setup_data.callback_data = data; + msg.rpc_argp = &data->args; + msg.rpc_resp = &data->res; + NFS_PROTO(inode)->write_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->write_setup(data, sync); rpc_execute(&data->task); @@ -782,7 +809,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, struct rpc_clnt *clnt = NFS_CLIENT(inode); struct nfs_direct_req *dreq; size_t wsize = NFS_SERVER(inode)->wsize; - int sync = 0; + int sync = NFS_UNSTABLE; dreq = nfs_direct_req_alloc(); if (!dreq) @@ -790,7 +817,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, nfs_alloc_commit_data(dreq); if (dreq->commit_data == NULL || count < wsize) - sync = FLUSH_STABLE; + sync = NFS_FILE_SYNC; dreq->inode = inode; dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp)); diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index 4cdc236..e68580e 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -732,16 +732,9 @@ static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data) return 0; } -static void nfs3_proc_read_setup(struct nfs_read_data *data) +static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs3_procedures[NFS3PROC_READ], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ]; } static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data) @@ -753,24 +746,9 @@ static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data) return 0; } -static void nfs3_proc_write_setup(struct nfs_write_data *data, int how) +static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs3_procedures[NFS3PROC_WRITE], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - - data->args.stable = NFS_UNSTABLE; - if (how & FLUSH_STABLE) { - data->args.stable = NFS_FILE_SYNC; - if (NFS_I(data->inode)->ncommit) - data->args.stable = NFS_DATA_SYNC; - } - - /* Finalize the task. */ - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE]; } static int nfs3_commit_done(struct rpc_task *task, struct nfs_write_data *data) @@ -781,16 +759,9 @@ static int nfs3_commit_done(struct rpc_task *task, struct nfs_write_data *data) return 0; } -static void nfs3_proc_commit_setup(struct nfs_write_data *data, int how) +static void nfs3_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT]; } static int diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index ff2c5f8..7c0baf2 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2432,18 +2432,10 @@ static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) return 0; } -static void nfs4_proc_read_setup(struct nfs_read_data *data) +static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - data->timestamp = jiffies; - - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; } static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) @@ -2461,33 +2453,15 @@ static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) return 0; } -static void nfs4_proc_write_setup(struct nfs_write_data *data, int how) +static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - struct inode *inode = data->inode; - struct nfs_server *server = NFS_SERVER(inode); - int stable; - - if (how & FLUSH_STABLE) { - if (!NFS_I(inode)->ncommit) - stable = NFS_FILE_SYNC; - else - stable = NFS_DATA_SYNC; - } else - stable = NFS_UNSTABLE; - data->args.stable = stable; + struct nfs_server *server = NFS_SERVER(data->inode); + data->args.bitmask = server->attr_bitmask; data->res.server = server; - data->timestamp = jiffies; - /* Finalize the task. */ - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; } static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) @@ -2502,20 +2476,13 @@ static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) return 0; } -static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how) +static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; struct nfs_server *server = NFS_SERVER(data->inode); data->args.bitmask = server->attr_bitmask; data->res.server = server; - - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; } /* diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c index 4f80d88..c9f46a2 100644 --- a/fs/nfs/proc.c +++ b/fs/nfs/proc.c @@ -565,16 +565,9 @@ static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data) return 0; } -static void nfs_proc_read_setup(struct nfs_read_data *data) +static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs_procedures[NFSPROC_READ], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs_procedures[NFSPROC_READ]; } static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) @@ -584,24 +577,15 @@ static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data) return 0; } -static void nfs_proc_write_setup(struct nfs_write_data *data, int how) +static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) { - struct rpc_message msg = { - .rpc_proc = &nfs_procedures[NFSPROC_WRITE], - .rpc_argp = &data->args, - .rpc_resp = &data->res, - .rpc_cred = data->cred, - }; - /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */ data->args.stable = NFS_FILE_SYNC; - - /* Finalize the task. */ - rpc_call_setup(&data->task, &msg, 0); + msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE]; } static void -nfs_proc_commit_setup(struct nfs_write_data *data, int how) +nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) { BUG(); } diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 8f1eb08..e9dbdc8 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -153,6 +153,16 @@ static void nfs_readpage_release(struct nfs_page *req) nfs_release_request(req); } +static void nfs_execute_read(struct nfs_read_data *data) +{ + struct rpc_clnt *clnt = NFS_CLIENT(data->inode); + sigset_t oldset; + + rpc_clnt_sigmask(clnt, &oldset); + rpc_execute(&data->task); + rpc_clnt_sigunmask(clnt, &oldset); +} + /* * Set up the NFS read request struct */ @@ -162,8 +172,14 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, { struct inode *inode = req->wb_context->path.dentry->d_inode; int swap_flags = IS_SWAPFILE(inode) ? NFS_RPC_SWAPFLAGS : 0; + struct rpc_message msg = { + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = req->wb_context->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), + .rpc_message = &msg, .callback_ops = call_ops, .callback_data = data, .flags = RPC_TASK_ASYNC | swap_flags, @@ -171,7 +187,7 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, data->req = req; data->inode = inode; - data->cred = req->wb_context->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(inode); data->args.offset = req_offset(req) + offset; @@ -186,8 +202,8 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, nfs_fattr_init(&data->fattr); /* Set up the initial task struct. */ + NFS_PROTO(inode)->read_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->read_setup(data); dprintk("NFS: %5u initiated read call (req %s/%Ld, %u bytes @ offset %Lu)\n", data->task.tk_pid, @@ -195,6 +211,8 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, (long long)NFS_FILEID(inode), count, (unsigned long long)data->args.offset); + + nfs_execute_read(data); } static void @@ -211,19 +229,6 @@ nfs_async_read_error(struct list_head *head) } /* - * Start an async read operation - */ -static void nfs_execute_read(struct nfs_read_data *data) -{ - struct rpc_clnt *clnt = NFS_CLIENT(data->inode); - sigset_t oldset; - - rpc_clnt_sigmask(clnt, &oldset); - rpc_execute(&data->task); - rpc_clnt_sigunmask(clnt, &oldset); -} - -/* * Generate multiple requests to fill a single page. * * We optimize to reduce the number of read operations on the wire. If we @@ -277,7 +282,6 @@ static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigne rsize, offset); offset += rsize; nbytes -= rsize; - nfs_execute_read(data); } while (nbytes != 0); return 0; @@ -315,8 +319,6 @@ static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned req = nfs_list_entry(data->pages.next); nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0); - - nfs_execute_read(data); return 0; out_bad: nfs_async_read_error(head); diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 8d90e90..9a69469 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -764,6 +764,16 @@ static int flush_task_priority(int how) return RPC_PRIORITY_NORMAL; } +static void nfs_execute_write(struct nfs_write_data *data) +{ + struct rpc_clnt *clnt = NFS_CLIENT(data->inode); + sigset_t oldset; + + rpc_clnt_sigmask(clnt, &oldset); + rpc_execute(&data->task); + rpc_clnt_sigunmask(clnt, &oldset); +} + /* * Set up the argument/result storage required for the RPC call. */ @@ -776,8 +786,14 @@ static void nfs_write_rpcsetup(struct nfs_page *req, struct inode *inode = req->wb_context->path.dentry->d_inode; int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; int priority = flush_task_priority(how); + struct rpc_message msg = { + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = req->wb_context->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), + .rpc_message = &msg, .callback_ops = call_ops, .callback_data = data, .flags = flags, @@ -789,7 +805,7 @@ static void nfs_write_rpcsetup(struct nfs_page *req, data->req = req; data->inode = inode = req->wb_context->path.dentry->d_inode; - data->cred = req->wb_context->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(inode); data->args.offset = req_offset(req) + offset; @@ -797,6 +813,12 @@ static void nfs_write_rpcsetup(struct nfs_page *req, data->args.pages = data->pagevec; data->args.count = count; data->args.context = req->wb_context; + data->args.stable = NFS_UNSTABLE; + if (how & FLUSH_STABLE) { + data->args.stable = NFS_DATA_SYNC; + if (!NFS_I(inode)->ncommit) + data->args.stable = NFS_FILE_SYNC; + } data->res.fattr = &data->fattr; data->res.count = count; @@ -804,8 +826,8 @@ static void nfs_write_rpcsetup(struct nfs_page *req, nfs_fattr_init(&data->fattr); /* Set up the initial task struct. */ + NFS_PROTO(inode)->write_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->write_setup(data, how); dprintk("NFS: %5u initiated write call " "(req %s/%Ld, %u bytes @ offset %Lu)\n", @@ -814,16 +836,8 @@ static void nfs_write_rpcsetup(struct nfs_page *req, (long long)NFS_FILEID(inode), count, (unsigned long long)data->args.offset); -} -static void nfs_execute_write(struct nfs_write_data *data) -{ - struct rpc_clnt *clnt = NFS_CLIENT(data->inode); - sigset_t oldset; - - rpc_clnt_sigmask(clnt, &oldset); - rpc_execute(&data->task); - rpc_clnt_sigunmask(clnt, &oldset); + nfs_execute_write(data); } /* @@ -870,7 +884,6 @@ static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned wsize, offset, how); offset += wsize; nbytes -= wsize; - nfs_execute_write(data); } while (nbytes != 0); return 0; @@ -918,7 +931,6 @@ static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned i /* Set up the argument struct */ nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); - nfs_execute_write(data); return 0; out_bad: while (!list_empty(head)) { @@ -1152,8 +1164,14 @@ static void nfs_commit_rpcsetup(struct list_head *head, struct inode *inode = first->wb_context->path.dentry->d_inode; int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; int priority = flush_task_priority(how); + struct rpc_message msg = { + .rpc_argp = &data->args, + .rpc_resp = &data->res, + .rpc_cred = first->wb_context->cred, + }; struct rpc_task_setup task_setup_data = { .rpc_client = NFS_CLIENT(inode), + .rpc_message = &msg, .callback_ops = &nfs_commit_ops, .callback_data = data, .flags = flags, @@ -1166,7 +1184,7 @@ static void nfs_commit_rpcsetup(struct list_head *head, list_splice_init(head, &data->pages); data->inode = inode; - data->cred = first->wb_context->cred; + data->cred = msg.rpc_cred; data->args.fh = NFS_FH(data->inode); /* Note: we always request a commit of the entire inode */ @@ -1178,10 +1196,12 @@ static void nfs_commit_rpcsetup(struct list_head *head, nfs_fattr_init(&data->fattr); /* Set up the initial task struct. */ + NFS_PROTO(inode)->commit_setup(data, &msg); rpc_init_task(&data->task, &task_setup_data); - NFS_PROTO(inode)->commit_setup(data, how); dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); + + nfs_execute_write(data); } /* @@ -1201,7 +1221,6 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how) /* Set up the argument struct */ nfs_commit_rpcsetup(head, data, how); - nfs_execute_write(data); return 0; out_bad: while (!list_empty(head)) { diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index daab252..6b213a6 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -816,11 +816,11 @@ struct nfs_rpc_ops { struct nfs_pathconf *); int (*set_capabilities)(struct nfs_server *, struct nfs_fh *); __be32 *(*decode_dirent)(__be32 *, struct nfs_entry *, int plus); - void (*read_setup) (struct nfs_read_data *); + void (*read_setup) (struct nfs_read_data *, struct rpc_message *); int (*read_done) (struct rpc_task *, struct nfs_read_data *); - void (*write_setup) (struct nfs_write_data *, int how); + void (*write_setup) (struct nfs_write_data *, struct rpc_message *); int (*write_done) (struct rpc_task *, struct nfs_write_data *); - void (*commit_setup) (struct nfs_write_data *, int how); + void (*commit_setup) (struct nfs_write_data *, struct rpc_message *); int (*commit_done) (struct rpc_task *, struct nfs_write_data *); int (*file_open) (struct inode *, struct file *); int (*file_release) (struct inode *, struct file *);